31885920029 has 2 divisors, whose sum is σ = 31885920030. Its totient is φ = 31885920028.

The previous prime is 31885919999. The next prime is 31885920041. The reversal of 31885920029 is 92002958813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29723484025 + 2162436004 = 172405^2 + 46502^2 .

It is an emirp because it is prime and its reverse (92002958813) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31885920029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31885920089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15942960014 + 15942960015.

It is an arithmetic number, because the mean of its divisors is an integer number (15942960015).

Almost surely, 2^31885920029 is an apocalyptic number.

It is an amenable number.

31885920029 is a deficient number, since it is larger than the sum of its proper divisors (1).

31885920029 is an equidigital number, since it uses as much as digits as its factorization.

31885920029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 31885920029 in words is "thirty-one billion, eight hundred eighty-five million, nine hundred twenty thousand, twenty-nine".